Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate

This study aimed at assessing the anaerobic co-digestion of food waste and microalgal biomass. Microalgae were harvested from an open treatment pond used for digestate treatment. For that, two continuous laboratory-scale reactors were operated over 200 days at ambient temperature. Results obtained s...

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Autores: Pereira de Castro, Iacy Maria, de Alencar Neves, Thiago, Pereira Rosa, André, França da Cunha, Fernando, Passos, Fabiana Lopes del Rei|||0000-0001-7501-988X
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/438904
Acceso en línea:https://hdl.handle.net/2117/438904
https://dx.doi.org/10.1016/j.algal.2025.103947
Access Level:acceso abierto
Palabra clave:Anaerobic digestion
Biofertilizer
Biogas
Microalgal biomass
Resource recovery
VFA
Àrees temàtiques de la UPC::Enginyeria civil::Impacte ambiental
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spelling Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestatePereira de Castro, Iacy Mariade Alencar Neves, ThiagoPereira Rosa, AndréFrança da Cunha, FernandoPassos, Fabiana Lopes del Rei|||0000-0001-7501-988XAnaerobic digestionBiofertilizerBiogasMicroalgal biomassResource recoveryVFAÀrees temàtiques de la UPC::Enginyeria civil::Impacte ambientalThis study aimed at assessing the anaerobic co-digestion of food waste and microalgal biomass. Microalgae were harvested from an open treatment pond used for digestate treatment. For that, two continuous laboratory-scale reactors were operated over 200 days at ambient temperature. Results obtained showed that the reactor fed with a 75:25 mixture of food waste and microalgae (based on volatile solids) improved process stability, overcoming volatile fatty acid accumulation and pH drop, compared to mono-digestion of food waste. Consequently, co-digestion increased methane yield in 20–32 % (0.22 L CH4/g VS). Moreover, the agronomic assessment revealed that digestates exhibited potential for use as a biofertilizer, i.e. adequate organic matter and nutrient contents heavy metals concentrations below limits established by different regulations (i.e., Zn, Ni, Cr, and Cu). These findings indicate that the anaerobic co-digestion of food waste and microalgae may offer potential for biomass valorisation in a circular approach, generating bioenergy and biofertilizer.The authors acknowledge the National Council for Scientific and Technological Development (CNPq) for funding the research project (BIOROBORO 437197/2018-2). Iacy Maria Pereira de Castro appreci ates the Coordination for the Improvement of Higher Education Personnel (CAPES) for funding her PhD studies.Peer ReviewedElsevier20252025-03-0120252025-07-17journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/438904https://dx.doi.org/10.1016/j.algal.2025.103947reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4389042026-05-27T15:37:01Z
dc.title.none.fl_str_mv Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate
title Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate
spellingShingle Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate
Pereira de Castro, Iacy Maria
Anaerobic digestion
Biofertilizer
Biogas
Microalgal biomass
Resource recovery
VFA
Àrees temàtiques de la UPC::Enginyeria civil::Impacte ambiental
title_short Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate
title_full Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate
title_fullStr Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate
title_full_unstemmed Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate
title_sort Long-term assessment of anaerobic co-digestion of food waste and microalgae: process stabilization, methane yield and agronomic properties of digestate
dc.creator.none.fl_str_mv Pereira de Castro, Iacy Maria
de Alencar Neves, Thiago
Pereira Rosa, André
França da Cunha, Fernando
Passos, Fabiana Lopes del Rei|||0000-0001-7501-988X
author Pereira de Castro, Iacy Maria
author_facet Pereira de Castro, Iacy Maria
de Alencar Neves, Thiago
Pereira Rosa, André
França da Cunha, Fernando
Passos, Fabiana Lopes del Rei|||0000-0001-7501-988X
author_role author
author2 de Alencar Neves, Thiago
Pereira Rosa, André
França da Cunha, Fernando
Passos, Fabiana Lopes del Rei|||0000-0001-7501-988X
author2_role author
author
author
author
dc.subject.none.fl_str_mv Anaerobic digestion
Biofertilizer
Biogas
Microalgal biomass
Resource recovery
VFA
Àrees temàtiques de la UPC::Enginyeria civil::Impacte ambiental
topic Anaerobic digestion
Biofertilizer
Biogas
Microalgal biomass
Resource recovery
VFA
Àrees temàtiques de la UPC::Enginyeria civil::Impacte ambiental
description This study aimed at assessing the anaerobic co-digestion of food waste and microalgal biomass. Microalgae were harvested from an open treatment pond used for digestate treatment. For that, two continuous laboratory-scale reactors were operated over 200 days at ambient temperature. Results obtained showed that the reactor fed with a 75:25 mixture of food waste and microalgae (based on volatile solids) improved process stability, overcoming volatile fatty acid accumulation and pH drop, compared to mono-digestion of food waste. Consequently, co-digestion increased methane yield in 20–32 % (0.22 L CH4/g VS). Moreover, the agronomic assessment revealed that digestates exhibited potential for use as a biofertilizer, i.e. adequate organic matter and nutrient contents heavy metals concentrations below limits established by different regulations (i.e., Zn, Ni, Cr, and Cu). These findings indicate that the anaerobic co-digestion of food waste and microalgae may offer potential for biomass valorisation in a circular approach, generating bioenergy and biofertilizer.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-03-01
2025
2025-07-17
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/438904
https://dx.doi.org/10.1016/j.algal.2025.103947
url https://hdl.handle.net/2117/438904
https://dx.doi.org/10.1016/j.algal.2025.103947
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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